Acres to Square Feet Converter
Convert acres to square feet. Enter a land area in acres and the tool returns square feet, where one acre is exactly 43,560 square feet. It is the conversion you need for lot sizes, farmland, and real-estate listings when you want to picture an acre in the more tangible square footage of a building plot.
Calculate
Default result: 43,560 ft²
Acres to Square Feet Converter · Result
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Square feet
1 acre
Reviewed by the calculators.dev team · Last updated 2026-06-23
How to calculate
Type the number of acres and read the square feet below. To convert by hand, multiply acres by 43,560: a quarter-acre lot is 0.25 × 43,560 = 10,890 square feet. To convert square feet back to acres, divide by 43,560. The result updates as you type so you can size several parcels.
square feet = acres × 43,560, where 43,560 is the exact number of square feet in one acre (an acre is one chain by one furlong, or 66 ft × 660 ft). Equivalently, acres = square feet ÷ 43,560.
Example calculation
1 acre multiplied by 43,560 square feet per acre is 43,560 square feet. The acre is a historical land unit defined as 43,560 square feet — a chain by a furlong — so the conversion is a fixed whole number.
- result
- 43,560 ft²
Assumptions
- One acre is defined as exactly 43,560 square feet, so the conversion is a fixed whole number.
- This is the international acre; the US survey acre differs by a negligible amount used only in large land surveys.
- An acre is an area, not a shape — 43,560 square feet can be any rectangle or irregular plot, not necessarily a square.
Common mistakes
- Picturing an acre as a fixed square — it is an area, so a long narrow lot and a square lot can both be exactly one acre.
- Confusing acres with hectares; one hectare is about 2.47 acres, so the two are not interchangeable.
- Reversing the direction — multiply by 43,560 for square feet, divide by 43,560 for acres.
Frequently asked questions
How many square feet is 1 acre?
One acre is exactly 43,560 square feet.
What is a quarter acre in square feet?
A quarter acre is 10,890 square feet (0.25 × 43,560), a common residential lot size.
Is an acre a square shape?
No. An acre is an area of 43,560 square feet in any shape. A square acre is about 208.7 feet on a side, but most lots are not square.
How many acres is a hectare?
One hectare is about 2.471 acres, since a hectare is 10,000 square meters and an acre is about 4,047 square meters.